﻿<!DOCTYPE html>
<html>
<head>
  <title>State Chart with Draggable Link Labels</title>
  <!-- Copyright 1998-2021 by Northwoods Software Corporation. -->
  <meta name="description" content="TypeScript: Allow the user to shift link labels; useful when the user wants to adjust the position of the label relative to the link path to avoid overlapping the link path or any nodes." />
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <script src="../assets/js/goSamples.js"></script> <!-- this is only for the GoJS Samples framework -->
</head>
<body>
  <div id="sample">
    <div id="myDiagramDiv" style="background-color: whitesmoke; border: solid 1px black; width: 100%; height: 400px"></div>
    <p>
      This sample is a modification of the <a href="../samples/stateChart.html">State Chart</a> sample that makes use of
      the LinkLabelDraggingTool that is defined in its own file, as <a href="LinkLabelDraggingTool.ts">LinkLabelDraggingTool.ts</a>.
    </p>
    <p>
      Note that after dragging a link label you can move a node connected by that link and the label maintains the same position
      relative to the link route. That relative position is specified by the <a>GraphObject.segmentOffset</a> property.
      This sample also saves any changes to that property by means of a TwoWay <a>Binding</a>.
    </p>
    <p>
      See also the similar <a href="LinkLabelOnPathDragging.html" target="_blank">Link Label On Path Dragging sample</a>,
      where the label is constrained to remain on the path of the link.
    </p>
    <button id="SaveButton">Save</button>
    <button id="LoadButton">Load</button> Diagram Model saved in JSON format:
    <br />
    <textarea id="mySavedModel" style="width:100%;height:300px">
{ "nodeKeyProperty": "id",
  "nodeDataArray": [
    { "id": 0, "loc": "120 120", "text": "Initial" },
    { "id": 1, "loc": "330 120", "text": "First down" },
    { "id": 2, "loc": "226 376", "text": "First up" },
    { "id": 3, "loc": "60 276", "text": "Second down" },
    { "id": 4, "loc": "226 226", "text": "Wait" }
  ],
  "linkDataArray": [
    { "from": 0, "to": 0, "text": "up or timer", "curviness": -20 },
    { "from": 0, "to": 1, "text": "down", "curviness": 20 },
    { "from": 1, "to": 0, "text": "up (moved)\nPOST", "curviness": 20 },
    { "from": 1, "to": 1, "text": "down", "curviness": -20 },
    { "from": 1, "to": 2, "text": "up (no move)" },
    { "from": 1, "to": 4, "text": "timer" },
    { "from": 2, "to": 0, "text": "timer\nPOST" },
    { "from": 2, "to": 3, "text": "down" },
    { "from": 3, "to": 0, "text": "up\nPOST\n(dblclick\nif no move)" },
    { "from": 3, "to": 3, "text": "down or timer", "curviness": 20 },
    { "from": 4, "to": 0, "text": "up\nPOST" },
    { "from": 4, "to": 4, "text": "down" }
  ]
}
    </textarea>
  </div>

  <script type="module" id="code">
    import * as go from "../release/go-module.js";
    import { LinkLabelDraggingTool } from './LinkLabelDraggingTool.js';

    if (window.goSamples) window.goSamples(); // init for these samples -- you don't need to call this
    const $ = go.GraphObject.make; // for conciseness in defining templates

    const myDiagram =
      $(go.Diagram, 'myDiagramDiv', // must name or refer to the DIV HTML element
        {
          // have mouse wheel events zoom in and out instead of scroll up and down
          'toolManager.mouseWheelBehavior': go.ToolManager.WheelZoom,
          // support double-click in background creating a new node
          'clickCreatingTool.archetypeNodeData': { text: 'new node' },
          // enable undo & redo
          'undoManager.isEnabled': true
        });
    // install the LinkLabelDraggingTool as a "mouse move" tool
    myDiagram.toolManager.mouseMoveTools.insertAt(0, new LinkLabelDraggingTool());

    // when the document is modified, add a "*" to the title and enable the "Save" button
    myDiagram.addDiagramListener('Modified', (e) => {
      const button = document.getElementById('SaveButton');
      if (button) button.disabled = !myDiagram.isModified;

      const idx = document.title.indexOf('*');
      if (myDiagram.isModified) {
        if (idx < 0) document.title += '*';
      } else {
        if (idx >= 0) document.title = document.title.substr(0, idx);
      }
    });

    // define the Node template
    myDiagram.nodeTemplate =
      $(go.Node, 'Auto',
        new go.Binding('location', 'loc', go.Point.parse).makeTwoWay(go.Point.stringify),
        // define the node's outer shape, which will surround the TextBlock
        $(go.Shape, 'RoundedRectangle',
          {
            parameter1: 20,
            fill: $(go.Brush, 'Linear', { 0: 'rgb(254, 201, 0)', 1: 'rgb(254, 162, 0)' }),
            stroke: 'black',
            portId: '',
            fromLinkable: true,
            fromLinkableSelfNode: true,
            fromLinkableDuplicates: true,
            toLinkable: true,
            toLinkableSelfNode: true,
            toLinkableDuplicates: true,
            cursor: 'pointer'
        }),
        $(go.TextBlock,
          {
            font: 'bold 11pt helvetica, bold arial, sans-serif',
            editable: true // editing the text automatically updates the model data
          },
          new go.Binding('text', 'text').makeTwoWay())
      );

    // unlike the normal selection Adornment, this one includes a Button
    myDiagram.nodeTemplate.selectionAdornmentTemplate =
      $(go.Adornment, 'Spot',
        $(go.Panel, 'Auto',
          $(go.Shape, { fill: null, stroke: 'blue', strokeWidth: 2 }),
          $(go.Placeholder) // this represents the selected Node
        ),
        // the button to create a "next" node, at the top-right corner
        $('Button',
          {
            alignment: go.Spot.TopRight,
            click: addNodeAndLink // this function is defined below
          },
          $(go.Shape, 'PlusLine',
            { desiredSize: new go.Size(6, 6) })
        ) // end button
      ); // end Adornment

    // clicking the button inserts a new node to the right of the selected node,
    // and adds a link to that new node
    function addNodeAndLink(e, obj) {
      const adorn = obj.part;
      const fromNode = adorn.adornedPart;
      if (fromNode === null) return;
      e.handled = true;
      const diagram = e.diagram;
      diagram.startTransaction('Add State');
      // get the node data for which the user clicked the button
      const fromData = fromNode.data;
      // create a new "State" data object, positioned off to the right of the adorned Node
      const toData = { text: 'new' };
      const p = fromNode.location.copy();
      p.x += 200;
      toData.loc = go.Point.stringify(p); // the "loc" property is a string, not a Point object
      // add the new node data to the model
      const model = diagram.model;
      model.addNodeData(toData);
      // create a link data from the old node data to the new node data
      const linkdata = {
          from: model.getKeyForNodeData(fromData),
          to: model.getKeyForNodeData(toData),
          text: 'transition'
      };
      // and add the link data to the model
      model.addLinkData(linkdata);
      // select the new Node
      const newnode = diagram.findNodeForData(toData);
      diagram.select(newnode);
      diagram.commitTransaction('Add State');
      // if the new node is off-screen, scroll the diagram to show the new node
      if (newnode !== null) diagram.scrollToRect(newnode.actualBounds);
    }

    // replace the default Link template in the linkTemplateMap
    myDiagram.linkTemplate =
      $(go.Link, // the whole link panel
        { curve: go.Link.Bezier, adjusting: go.Link.Stretch, reshapable: true },
        new go.Binding('points').makeTwoWay(),
        new go.Binding('curviness', 'curviness'),
        $(go.Shape, // the link shape
          { strokeWidth: 1.5 }), $(go.Shape, // the arrowhead
          { toArrow: 'standard', stroke: null }),
        $(go.Panel, 'Auto', { cursor: 'move' }, // visual hint that the user can do something with this link label
          $(go.Shape, // the label background, which becomes transparent around the edges
          {
            fill: $(go.Brush, 'Radial', { 0: 'rgb(240, 240, 240)', 0.3: 'rgb(240, 240, 240)', 1: 'rgba(240, 240, 240, 0)' }),
            stroke: null
          }),
          $(go.TextBlock, 'transition', // the label text
            {
                textAlign: 'center',
                font: '10pt helvetica, arial, sans-serif',
                stroke: 'black',
                margin: 4,
                editable: true // editing the text automatically updates the model data
            },
            new go.Binding('text', 'text').makeTwoWay()),
          // The GraphObject.segmentOffset property is what the LinkLabelDraggingTool modifies.
          // This TwoWay binding saves any changes to the same named property on the link data.
          new go.Binding('segmentOffset', 'segmentOffset', go.Point.parse).makeTwoWay(go.Point.stringify)
        )
      );

    // read in the JSON-format data from the "mySavedModel" element
    load();

    window.myDiagram = myDiagram; // Attach to the window for console debugging

    // Show the diagram's model in JSON format
    function save() {
      document.getElementById('mySavedModel').value = myDiagram.model.toJson();
      myDiagram.isModified = false;
    }
    function load() {
      myDiagram.model = go.Model.fromJson(document.getElementById('mySavedModel').value);
    }
    document.getElementById("SaveButton").onclick = save;
    document.getElementById("LoadButton").onclick = load;
  </script>
</body>
</html>